1、简 便 计 算6.62.5 4.6+ + +5.4 ( )212 635 1178 613 123 325635 3415 57 314 342.8+ +7.2+ +2.25+ + + + +549 359 438 558734 725457235 53611 164716511+ + + 0.75+ + +0.375 + + +237359 337149147 5814 45 945994599945999945( + ) 5- - 48.3- - 4.25+ 6445 245512 214171317 1516456 956 4140.6250.5+ + 62.5% 2.5( + + +
2、)5812 3138 72513 3138 91091091091022 +2575%-70.75 0.2563.5 2.5- 34 14 1312 6715 212 4715+3.125+ + +( -1.8) (111+999) 56( - )389 119178 1645 247 373849.5 -(50- )0.6 + + 45( + 0.6)1035 12 711 414195519 147711 79415897 37.5%+1040.375 ( 5.375) 3.5 +1.25 +3.838 314 538 114 2710 457199 3755+2996 8439+1001446+295 888+999 1125-996299101 563999 21002060.25 72156-5672 253212570999+709 0.2548 2.5 0.4237 132 6.6+2.56 75.399+75.312 354.63.7+540.37 0.125 + 8.25+12.5%341811 6 1 15 4.25578 13 23 314 3419.826.573.43 4.6+3 +6 +5.425 354 +2.25+5 +7 9.632.5438 58 348.37-3.25-(1.37+1.75)
